After the recent update to Files App which introduced new Windows 11-styled rounded corners on certain Windows 10 elements, the app has now received another visual upgrade with new "fake mica" theme.
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Files 2.4 is now available to all. The latest update moves the app from UWP over to Windows App SDK. Aside from that, the new version also contains plenty of new changes detailed in a long changelog.
After open sourcing the Windows 3.0 File Manager last year, Microsoft has now released it to the Windows 10 Store as a UWP app. It's available for all Windows 10 devices on build 16299 or higher.